In this paper,based on the theory of Auto Partitioned Iterated Function System (PIFS) Compression, a new line-scan double-threshold adaptive multi-level partitioning compression algorithm is proposed. Compared with no...In this paper,based on the theory of Auto Partitioned Iterated Function System (PIFS) Compression, a new line-scan double-threshold adaptive multi-level partitioning compression algorithm is proposed. Compared with normal short-distance block-based method,at the nearly same PSNR value,the new method can obtain a higher PSNR value, whereas compress ratio is hardly changed. Based on the above, a new line-scan H-V multi-level partitioning compression algorithm improves the compression ratio with a slightly-reduced decoding quality.展开更多
在充分考虑人类视觉系统掩蔽特性的基础上,首先给出基于图像分块的临界噪声阈值矩阵JND(justnoticeab le d ifference),进而提出了一种结合离散小波变换(DWT)和离散余弦变换(DCT)域的采用灰度图像作为水印的具有较好鲁棒性的公开水印技...在充分考虑人类视觉系统掩蔽特性的基础上,首先给出基于图像分块的临界噪声阈值矩阵JND(justnoticeab le d ifference),进而提出了一种结合离散小波变换(DWT)和离散余弦变换(DCT)域的采用灰度图像作为水印的具有较好鲁棒性的公开水印技术。实验结果表明,该算法对常见图像处理操作、有损压缩和裁剪、挤压、像素移位等几何变换有较好的鲁棒性,特别是信号增强操作处理几乎不影响水印的正确提取。展开更多
文摘In this paper,based on the theory of Auto Partitioned Iterated Function System (PIFS) Compression, a new line-scan double-threshold adaptive multi-level partitioning compression algorithm is proposed. Compared with normal short-distance block-based method,at the nearly same PSNR value,the new method can obtain a higher PSNR value, whereas compress ratio is hardly changed. Based on the above, a new line-scan H-V multi-level partitioning compression algorithm improves the compression ratio with a slightly-reduced decoding quality.
文摘在充分考虑人类视觉系统掩蔽特性的基础上,首先给出基于图像分块的临界噪声阈值矩阵JND(justnoticeab le d ifference),进而提出了一种结合离散小波变换(DWT)和离散余弦变换(DCT)域的采用灰度图像作为水印的具有较好鲁棒性的公开水印技术。实验结果表明,该算法对常见图像处理操作、有损压缩和裁剪、挤压、像素移位等几何变换有较好的鲁棒性,特别是信号增强操作处理几乎不影响水印的正确提取。